<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>bootstarp演示</title>
  <link rel="stylesheet" href="./bootstrap.min.css">

</head>

<body>
  <div>
    <span class="btn btn-primary">按钮</span>
    <a href="" class="btn btn-danger">按钮</a>
    <button class="btn btn-outline-info">按钮</button>
    <input type="text" class="form-control">
  </div>

  



  <script src="./popper.min.js"></script>
  <script src="./bootstrap.min.js"></script>

  <script src="./b01.js"></script>

</body>

</html>